Screw press



March 18, 1930.

F. V. ANDERSON ET AL SCREW PRESS March 18, 1930. F. V. ANDERSON ET L 1,750,916

scREw `PRESS Filed Dec. 17, 1928 2 Sheets-Sheet Patented Mar'. 1s, 1930 UNITED [STATES PATENT oFFlcE.

FREDERICK V. ANDERSON AND RAYMOND '.l. ANDERSON, 0F CLEVELAND, OHIO, AS- BIGNORS TO THE V. D. ANDERSON COMPANY, F CLEVELAND, OHIO, A CORPORA- TION OF OHIO SCREW PRESS Applicatin led December 17, 1928. Serial N'o. 826,605.

This invention relates to extracting presses of the screw type,'and particularly to structural details relating to the adjustment of the discharge choke and to the cooling of the l worm and choke structure@ The invention will be described as applied to a press of the type generally illustrated in Patents Nos. 829,314 and 829,315. The present application is subordinate to a prior application, Serial No. 282,631, filed June 4, 1928, in which application broad claims are made to method and apparatus for water-cool inthe chokes in presses of this type.

practical embodiment is illustrated in the accompanying drawings, in which,- Y

Fig. 1 is a vertical longitudinal axial section of so much of a press as is necessary to illustrate the present invention.

Fig. 2 is a. fragmentary view, on a somewhat enlarged scale, showing the tubular shaft extension with its water cooling pipe and indicating how the cake breaker is mounted in place.

Fig. 4 is a fragmentary sideelevation illustratinghow the cake breaker is formed and how it is mounted on the tubular shaft extension.

Fig. 5 is a fragmentary plan of the same.

Fig. 6 is a fragmentary view similar to a portion of Fig. 1, but drawn on an enlarged scale with the choke adjusting mechanismengaged to retract the choke, the choke being shown near its extreme retracted position.

Fig. is a fragmentary view similar to a portion of Fig. 6, but showing the parts set to feed the choke to the right, to its discharge restricted position.

Fig. 8'is a section on the line 8-8 of Fig. 7. Fg. 9 is a perspective view of the pinion bearing showing the pinion stop.

10 is a perspective view of the pinion, showing the coacting pinion stop. Portions of the base frame work of the press are indicated at 11 and 12. The feed hopper is shown at 13. The pressing chamber is of usual form, consisting of a plurality of s'paced'bars, not visible in .the drawings, and 5u' knife bars 15, the knife bars being for the Fig. 3 is a section on the line 3-3 of Fig. 2.

'indicated by the numeral 18 applied to its sleeve. Two pressing worms are shown at 19. Spacing collars are shown at 21, while at 22 is illustrated a duplex or double length pressing worm.

The purpose in making th'e worm 22 of double length is to allow it toproject beyond the left or discharge end of the shaft 16 and yet be locked to the shaft 16 by a key or spline 23, which also engages and retains the the shaft 16 terminates within the barrel or shell of the press and that at its end-it is reduced and threaded, as 'shown fin 24. The tubular shaft extension 25 extends into the worm unit 22 and is threaded at 24 on to the end of the shaft 16. It has a shoulder at 26 which seats against the end of the worm element 22 so thatthe extension 25 serves Vnot only as an. extension of the shaft 16 but also as a nut to retain the members 18, 19 and 22 on the shaft 16.

It will be observed that the key 23 transmits the torque of the worm members 18, 19 and 22 directly to the shaft 16, and that none of this torque is carried by theextension 25.

-The tubular extension 25 is preferably closed at its inner or right hand-end to avoid the leakage of cooling liquid. Threaded into the end of the extension 25 so as to form in effect a single operating unit therewith, is a further tubular shaft extension 27. This is supported in the frame of the machine by radial bearings 28 and thrust bearings 29 of the roller type, the particular form of these bearings not being a feature of the present invention.

The first extension A member 25 extends 'Worms 18 and 19. It will be observed that through an internally tapered annular choke 31 which is uided in a bushing 32 mounted in frame mem er 11. A. short Ydistance to the left, that is on the discharge side of the junction of the members 25 and 27, the latterA is somewhat reduced to offer clearance for the cake discharging through the choke 31. This reduced portion is illustrated at 33. 'To the left of the ,reduced portion 33 the sleeve is externally threaded, as indicated at 34, and between the threads 34 and the bearing 28 there is fixedly keyed to the shaft 27 a spur gear 35.` The extreme left end of the shaft 27 is housed in a water box 36 which is mounted on the frame 12 by means of brackets 37 and which makes a tight joint-with the shaft 27 by means of a stuing box 38. A

water drain connection 39 leads from thewater box 36. 90 'A ixed water supply pipe 41 enters the box 36 through the gland 42 and extends axially through the shaft extensions 25 and 27. This is the water supply pipe and it is so located that at its-right hand end, with reference to circuit through the -passages just described and some type of heat. exchanger, for example,-

an air cooled radiator or the equivalent.

The choke 31 is connected by machine screws 43 with a- U-shaped yoke 44. This straddles the reduced portion 33 of the tu- Y, bular extension 27 andfserves .to constrain the discharging cake to passage in a downward direction. The yoke andthe connected choke l 31 are held against rotation by engagement with lateral guides, one of which is shown at 45. In practice more than one are used to avoid the exertion of unbalanced lateral stresses on the choke. At the end opposite the choke 31-the yoke 44 carries an annular thrust member 46. ,This forms a part of a swivel bearing between the yoke 44 and the nut 47 mounted on the threaded portion 34 of the tubular extension 27.

It will be observed that the-part 46`en. circles a portion of the nut 47 and is retained thereon by a removable'thrust ring 48. The thrust is exerted through a roller thrust bearing 49 which is enclosed in a removable housing 51 having spur gear teeth 52 on its periphery. It will be observed thaty the rotal0 or another direction and shift the choke 31 to which the nut is connected through the yoke tion of the nut 47 relatively to the tubular extension 27" will cause the nut to move in one tubular shaft extensions. When the device is assembled and operating the shaft extensions and 27-a1e in effect a single piece and the only reason forll constructing them in two separable portions threaded together is to facilitate the removal of the nut 47 However, if the removal of the nut be otherwise provided for the members 25 and 27 can be constructed in a single piece.

The teeth 52 mesh with teeth of 'an elon- 'gated pinion 53 which is keyed on a shaft 54. The pinion 53 is of such length axially that the teeth 52 will mesh with it in all positions assumed by the nut 47. The shaft 54 is mounted in bearings 55, 56 and 57, supported on the frameworkof the press and splined on the shaft 54 is a pinion 58. The spline appears at 59 in Fig. 7. It may be here remarked that the pitch diameter of the pinion 58 is less than the pitch diameter of the pinion 53.

Pinion 58 is axially slidable on the shaft 54 so that it may enter into mesh with the spur ,A gear 35. Pinion 58 is shifted by a shipper fork, not shown, and carries a dental clutch member or lug 62 which when the pinion 58 is shifted to its extreme leftward position engages a companion lug 63 on the side of bearing 57. Thus the pinion58 may bemeshed with the gear 35 or locked against rotation by engagement of the lugs 62, 63. It has a normal intermediate position in which it engages neither. Under these conditions the friction of the n'ut 47 on the threadsl 34 is suilicient to retain the nut 47 in fixed position relatively to the shaft 27,' that is, there is no relative lrotation between them and the pinion 53 turns idly as the shaft 16 and extension 27 rotate together.

If it is desiredv to advance the choke 31, that is, feed it to the right relatively `to Fig. l 1, the pinion 58 is shifted to` the left until the lugs 62, 63, engage (see Fig. 7). Under such conditions rotation of the nut 47 -is arrested. As the shaft 27 (Lontinues to rotate 11o there is relative rotation -between the shaft and the nut and thevnut is fed axially in one direction. 'In the example illustrated it is fed to the right. If the pinion 58 be shifted to the right into mesh with the gear 35 (see Fig. 6) the gear trainoonsisting of the gear 35, pinion 58, pinion 53 and gear 52, will .drive the nut 47 from the shaft 27 at a higher rotative speed than lthat ofthe shaft. Thus again there is relative rotation ofthe nut 47 on the shaft 27 but in the opposite direction from that previously mentioned, so

that in the example illustrated, the choke 31 is retracted or drawn to the left. This offers a convenient means forv adj ustingthe choke by the ordinary operative motion of the press.

Under normal operative conditions of course `the choke 31 is ,maintained fixed in of the shaft 27 is a two-part collar 65 which carries a blade 66. This projects toward the choke, is sharpened at its end, and is steadied by being connected by screw 67 to the shaft 27. The purpose of this blade is to break up the tubular cake as it discharges through the choke. A pendant stop 68 is mounted in the yoke 44 for a similar purpose, as it serves to scrape away any cake which might otherwise accumulate on the threads 34.

It will be observed that the member 25 serves not only as an extension for the shaft 16 but also as a retainer or nut to hold the various worms in place on the shaft 16. A

The extensions 25 and 27 may be readily disconnected and dismounted without requiring the dismounting of lthe shaft 16. While the extension shaftacts as the cooling water conduit and also as the driving means for the choke adjusting mechanism, itis not subjected to any torsional load imposed by the pressing Worms.

While we have shown the cooling water as deliveredwithin the last pressing worm, be-

cause it is ordinarily sufficient, the invention is not limited to the idea of Acooling only the last worm, it being merely a matter of dimen sion how far the tubular .shaft projects into the worm structure. The same water which cools the worm structure flows through the extensions 25 and 27 and insures cooling of the choke, at which point probably the highest temperatures are developed. The use of water cooling reduces the tendency of the cake to burn and results in the production ofa merehantable cake under all circumstances, and usually results in the production of a better grade of oil. The water cooling is of especial advantage in extracting oil from copra.

The invention and its Various component features are susceptible of embodiment inspecically different forms and no necessary limitation to the struetureillustrated is implied, thoughI this is preferred on the basis of practical results had with it.

What is claimed is,--

l. ln a screw press, the combination of a press housing; a rotary shaft mounted therein; screw pressing means removably mounted on said shaft; a hollow extension threaded to the endof said shaft and serving to lock said screw pressing means thereon; an annular choke encircling said extension; and means for passing cooling fluid through said extension.

2. In a screw press, the :combination of a press housing; a rotary shaft mounted therein; screw pressing means removably mounted on said shaft; a tubular extension thread-4 ed to the end of said shaft and serving to lock the screw pressing means thereon; a. tapered annular choke axially adjustable relatively to said tubular extension to afford a variable annular discharge passage between the choke and member; and means for passing a cooling fluid through said tubular extension. y

3. In a screw press, the combination of a press housing; a rotary shaft mounted there- 1n; a worm structure splined on said shaft and extending beyond the end thereof; a tuin; a tubular extension releasably connected with said shaft; screw pressing means mounted to turn with said shaft and at least a part thereof encircling a part of said tubular extension, said means being retained in place lby the connection of the shaft and extension;

an adjustable choke encircling a portion of said extension to control the dischargefrom the press; and means for passing cooling fluid through said extension. j

5. In a screw press, the combination of a press housing; a rotary shaft mounted therein screw pressing means splined on said shaft and witlxdrawable over the end thereof; a tubular extension releasably connected with said end of said shaft and serving to retain said pressing means thereon a second tubular extension releasably connected with the first, and having a threaded portion and a reduced portion intervening between the threaded portion and the iirst tubular extension; a nut on the threaded portion of the second extension; an axially adjustable tapered choke coacting with at least one of said tubular extensions to control the press discharge; a driving connection between said nut -and chok'e; operator controlled means for causing said nut either to rotate with said tubular extension, or to rotate relatively thereto in either direction and means for passing cooling fluid through said extensions.

6. In a screw press, the combination of a press housing; a rotary shaft mounted therein screw pressing means splined on said shaft and withdrawable over the end thereof; a tubular extension releasably connected with said end of saidshaft and serving to retain said pressing means thereon; a second tubular extension releasably connected with the first, and having a threaded portion and a v,reduced portion intervening between the threaded portion and the.irst tubular extension; a nut on the threaded portion of the second extension; an axially adjustable ta-, pered choke coacting with at least 'one of said tubular extensions to control the press to rotate with said tubular extension, o r to rotate relatively thereto in either directlon;

and means for 'passing cooling fluid` through v said extensions. .n

7. In a screw press, the combination of a press housing; a rotary shaft mounted therein; screw pressing means splined on said shaft and projecting beyond the end thereof; a tubular shaft extension structure extending into the projecting portion of said means and threaded to said shaft to retain said means l in position on said shaft, said structure having-a choke portion, a threaded portion and an intervening reduced portion; a nut on the Y threaded portion; an axially adjustable tapered annular choke for cooperating with the choke portion of the `extension. structure; a driving connection between said :nut and choke; operator .controlled means for causing said nut either to rotate with said extension or to rotate relatively thereto in either direction; and means for passing cooling Huid through said extension adjacent said choke portion and adjacent the junction with said shaft.,

8. In a screw press, the'combination of a press housing; a rotary shaft mounted therein; screw pressing means splined on said shaft and projecting beyond the end thereof; a tubular shaft extension structure extending into the projecting portion of said means and threaded to sald shaft to retain said means in position on said shaft, said structure having a choke portion, a threaded portion and an intervening reduced portion; `a nut on the threadedy portion; an axially adjustable tapered annular choke for cooperating with the choke portion of the extension structure;

means for holding said choke against rota-V tion; a swiveled driving Vconnection between said nut v .and choke; operator controlled means for causing saidi-nut either to rotate with said extension or to rotate relatively thereto in either direction; and means for passing cooling iuid through said extension adjacent said choke portion and' adjacent the junctionwith said shaft. v

In testimony whereo We have signed our names to this specification.

FREDERICK V. ANDERSON. RAYMOND T. ANDERSON. 

